package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * @author 胡慧
 * @title: ConsumerFastStart
 * @projectName heima-leadnews
 * @description: 消费者消费消息
 * @date 2021/2/2416:31
 */
public class ConsumerFastStart {
    public static void main(String[] args) {
        //添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"81.70.87.22:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group2");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //消费者对象
        KafkaConsumer<String,String> consumer = new KafkaConsumer<String, String>(properties);
        //订阅主题
        consumer.subscribe(Collections.singletonList("heima-topic"));
    //当前线程处于监听状态
        while (true){
            //    获取消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
            }
        }
    }
}
